Parnassia fimbriata
originally thought this was Menyanthes trifoliata (buckbean) , that was quite wrong.

http://biology.burke.washington.edu/herbarium/imagecollection.php?Genus=Menyanthes&Species=trifoliata

Naches Peak Loop Trail
about 1700 meters (5600 feet elevation)
William O. Douglas Wilderness

12q3 595